Error on join condition with SqlAlchemy

Question

I\'m trying to use SQLAlchemy on my python app but I have a problem with the many to many relationship. I have 4 tables:

users, flags, commandes, channels, and commandes

Answer 1

back_populates needs to match the exact name of the related property on the other model. In Channel, you have back_populates="channels", but in Commande, you have:

channel = relationship("Channel", secondary="commandes_channels_flags", back_populates="commandes")

Instead, change channel = relationship to channels = relationship.

You'll also need to change the other relationship properties to Flag.commandes, Flag.channels, Channel.commandes, Channel.flags, and Commande.flags to match your back_populates arguments.